Pipe-bending machine



July 1-4, 1925.

- 1,546,147 F. A. c. SKINNER PIPE'BENDING MACHINE Filed April 25, 1924 s sheets-sheet 1' ww .Q n

m N m I July 14,1925.

F. A. c. SKINNER PIPE BENDING MACHINE 3 Sheets-Sheet 3 Filed April 25, 1924 Patented July 14, 1925.

TED

Er ENP Q' MMEIN m ms; we e as 12 4.- swal 2 45 To all whom it 000100702:

Be it known that I, FREDERICK A. C. Sni NnR, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented certain new anduseful Improvements in Pipe-Bending Machines, of which the following is a specification.

My in en has r t to mprovements pipe bending ma chines and consists in thenovel features of construction more fully set forth the specification and pointed outin the claims.

The object of the present invention is primarily to bend a length of pipe into coils of uniform length and having bends of a uniform radii, although itinay be effectively used for bending rods or'bars to any desired shape. further object is to provide a power driven bending machine which is au tomatic in its action except for feeding the machine which is manual. Furtlier and other ac lvantages will be better apparent from a detailed description of the invention in connection with the accompflny ng d wi g in w h Figure 1 'is atop plan of my improved di g m ne; i's- 2 is a nt elev tionthereof; 'Fig. 3' is an 'end elevetion' of the ma h n' F gs 4 i a n a ged top pl of he pipe'b n ing'me an sm a he end of the bending operationiFigj 5 is an enlarged top plan'of the bending mechanism in inoperative position, or idle, between bending operations; Fig. 6 is a combined side elevation end middleverticahcrosson hrough ear d b nd m hanism mounted thereon; Fig. 7'is a crosssectional detail taken on the line of Fig; 4; Fig. 8 is a side elevation of the pipe clamp hinged to the abutment member; Fig. 9 is abross-sectional'detail thereof taken on the line 9.9 of Fig. 8; and

Fig. 10 is a sectional detaii taken on the line 10-10 of Fig. 5.

Referring to the drawings, F represents a suitable struotural supporting frame cornp' s ne' p t 1, 1.. em, a ine lons dinal member 2,-and end members 3, 3 supp rte on 'se q P st nd n rme t 1 1,- gitudinal membe s 4:, e uppor e by h nd embers" Mo nt d 9?? me e s 1 described, it being unders stoi dthtt Pr m ch ne i made o b e 1 1mpr e tw bend n'g 1 2 1 mere y'te increase its 'efiiciency. A pinion 8 is' mounted' on 'a h having e ng a ac end ins. t 330.1% ng$ 0 s ure d qet' f d Said P n mes esv th' a bev lsear 1 kyed to a vertically disposed shift '12 mounted in a bearing 13 secured to one of t e e Sh f 12 ar ie apinibn on its i pper end said pinion meshing W t nd d in th sp ge ae :9 i r e b a m t rM ha n driv proc t 1 .co n e 0 a iri n sprb ket Q1 s a t y h in -71 2 s. misse t ea 7 W i is the PrQet m ted Y' ns element of the bending mechanism iseon stantly rotating hile motorM is running. h b din ile h n w th ear as t f u dati n ay i" b de r be "The spindle 5 over which gear rotates, terminates at its npper end in a redueed portion 18 over is placed an abutm n mem er he t e e fi y a nut 20 r wed ie atds l' 1 th nd 9f s id reduced p ifi ll b v e-ilv l9'b9i ighe d ageinstturning by. being bolted to en an 1e 22"seo'ured to"frar ne membjrs 4, '4. he, b men membe n r ded th s r cnlar side '23; and oppositely disposed shai h 3 de fau a 2 tangen al o ai circn a'r side, and a continuous groove 25 is formed in said sides'to receive. the pipe P i b 'l il i o e f y'eprear here? nae he r u par "(I li ers, 26 is conoentric with the rotation axis of'gealr 7 L Hinge'dly seeured to the abutment me n be .1918 e l l mrw se re y h ldi h Pi e i t t Par Qf ro v .6 form in ifi a'ig i d 2 of th abutment, q id cla'mp being described detail'belo'w; 'llhe, upper surface of gear "provided two ann'ular shoulders wand q, and the 285i the gear bounded shouldera is wh ne" m th" j lies" redid 29 formed in it, said slot opening into shoulder a, and being of slightly less depth than the combined height of shoulders a, a. A driving dog 30 is slidingly fitted into slot 29, and has a. recess 31 formed in its upper surface adjacent one side, and a stop screw 31 is screwed into the face 28 of the gear 7 on the edge of slot 29 so that the end of said screw will enter the recess 31 to limit the movement of the dog 30 in said slot. The dog 30 is shouldered at is near its free end and the nose 30 of said dog is urged out through the open end of the slot by a spring 32 positioned between the inner end of said dog and closed end of the slot 29. A'member 33having a. hub 34 at one end is slidingly mounted on the face 28 of gear 7, said hub being rotatably positioned over spindle 5 between gear 7 and abutment 19, and a pair of guides 35, 35, having their inner edges, 6, e, inclined outwardly, are.

securedto the upper face of member 33 adjacent to the sides thereof. A slide plate 36 is adapted to slide over the member 33 as a base, confined by the guides 35, 35,

said plate 36 having its edges 6, e inclined to cooperate with edges 6, e of the guides. The inner endof the slide plate 36 has a spindle 37 projecting upwardly from it on which is mounted a grooved roller 38, said roller being held on the spindle by a nut 39 screwed over the threaded terminal 40 of said spindle, and the outer end of said plate 36 has one corner cut out at right angles denoted by 00, the margins of said cut away portion intersecting the boundary of a. slightly more than semicircular recess The purpose of this formation will presently appear. The outer end of base plate 33 is provided with an opening 41 through which is passed a spindle 42 projecting from near one, end: of a lever 43, and a cam 44 is pinned to said spindle between base 33 and the marginal face of gear 7. The'relation of the parts is such that this places the cam 44 in close proximity to the nose 30 of dog 30 so that when the dog is expelled by spring 32 it will be in position to engage the cam 44 provided the high side of said cam is toward the dog. The function of the cam will be better apparent from what follows. The short armof lever 43 oper ated toward the center of gear 7 and its eX- tremity is shouldered as shown (Fig. 6)

to, receive the reducedend of a link 46, the

V opposite end 47 of said link being circular depending onwhether the lever is moved in shape and adapted to fit into recess y in plate 36. It should now be apparent that with an angular movement of lever 43 the link 46 will be drawn out or forced in,

from or toward dead. center with reference to, its spindle 42, and the slide 36. will like-.

1 wise be moved either out or in, and, further,

cam 44 will be rotated. It will now be apparent from Fig. 5 that the cut out corner as permits clearance for the swinging of link 46 when the lever 43 is oscillated to its angular position for withdrawing the roller 38 from abutment member 19.

It will be observed from Figs. 5, 6 and 7 that a lug a projects downwardly from, the bottom of base plate 33 at a point slightly inside of and beyond the pivotal point of link 46 with respect to the direction of rotation of gear 7, and this lug n is directly in the path of travel of dog 30 whensaid dog is in its outermost position in slot 29. However, should cam 44 be turnedto'the position shown in Fig. 5 thenose 30 of said dog will impinge on said cam which forces ber 19, the clamp 27 is provided, said clamp comprising a block 50 hinged at 49' to clamp 19, and a clamp member 51 pivotally connected at 52 toone end of said block. ;A pin'53 is rotatablymounted in the block near the other end, said pin carrying a lever 54 at one end and an eccentric 55 .at the. other end, said eccentric being rotatable in a slot 56 in the clamp member. After the pipe has been placed in groove 26 of the abutment member, the block 50 is swung downwardly (dotted Fig. 9) so that toothed groove 57 in the member 51 embraces the pipe after which the lever 54 is pulled down to cause the clamp member to come tightly T is provided between the gears 7 and eX- tending to one side of them, said table being in the same'plane with the bottom ofabutment 19. In order that the point at which the pipe is to be bent canbe quickly determined. a series of holes 60 are placed in the table T and a gauge piu 61 inserted in that one which islspaced correctly from the abut-i ment member to give the proper length coil whenthe pipe is bent. This will be better apparent from an inspection of Fig. 1.

In. the operation of the machine, uief power of motor M is transmitted, through the gearing heretofore described, to each of the gears 7 so that they will be Continuously rotating in opposite directions while the machine is in use. An operator is positioned alongside each gear 7 to perform such functions as are manual. We will assume that the bending ineihanisnr comprising slide 36, roller 38 and associated parts are in the position shown on the right hand side Fig. 1, which is the starting position for the bending operation. It will be noted (Fig. 5) that the lever 43 is in a position substantially at right angles to slide 36, side slide and roller 38 having been withdrawn by the link connection 46 with said lever, away from the abutment member 19. For this position of the lever 43 the cam 44 is turned as shown in Fig. 5 and its radial face 45'is out of the path of driving dog 30 the nose 30 of which is cammed by the outer periphery of cam 44 so that the dog 30 slips past the lug n. Thus the gear 7 may rotate idly when the lever 43 is inthe position just pointed out.

The operator now positions the pipe P that is to be bent, in groove 26 of the abutment member 19, and secures it therein by the clamp 27. The bending mechanism is now brought into play by manually swinging lever 43 to its position shown in Fig. 9, almost in line with slide 36. This movement of the lever straightens the toggle comprised of said lever and link 46 which forces the slide 36 and roller 38 inwardly toward abutment member 19, the groove of said roller embracing the pipe P. At the same time the cam 45 is rotated so that its face 44 comes opposite to the revolving driving dog 30 which impinges on the lug n and against cam face 45 thus driving plate 33, with the parts mounted on it, around in front of it, and rotating the entire bending mechanism. At the same time the pressure of the dog 30 against cam face 45 looks the toggle comprised of lever 43 and link 46. The rotation of roller 38 around abutment 19 obviously bends the pipe between the roller and abutment. When the pipe has been bent to a semicircle the lever 43 is tripped by the trip arm 58, secured to the side of the table opposite to that on which the bending operation began, said lever being swung to the position shown dotted in Fig. 4 and the toggle broken, thus with drawing slide 36 and roller 38 and rotating the cam 44 so that cam face 45' forces the dog 30 back in its slot and releases the lug n so that rotation of the bending mechanism is arrested. The gear 7 of course, with its driving dog 30 now rotates idly. The bending mechanism is now manually rotated back to the starting position shown in Fig. 5 and the lever 43 slipped behind the spring latch 59. Thebending operation may now be repeatedm- Having described my invention, I claim:

1.. Av pipe bending machine comprising-a suitable'frame, a diskrotatably mounted on saidv frame, a fixed abutment member centered over the rotation axis of said disk, a bending element rotatable about the axis of the disk and movable radially with respect to said axis, means for coupling the bending element to the disk and simultaneously moving same toward the rotation axis of' said disk, and means for uncoupling said bending element and disk and simultaneously withdrawing the bending element.

2. A pipe bending machine comprising a frame, a disk rotatably mounted thereon, a fixed abutment member centered over the rotation axis of said disk, a bending element loosely mounted on said disk and movable radially with respect to the axis thereof, a driving dog carried by said disk, a lug on the bending element adapted to be engaged by said dog for rotating'the bending element, and means for releasing said dog from the lug and simultaneouslytherewith mo"- ing the bending element outwardly from the rotation axis of the disk.

3. A pipe bending machine comprising a frame, a disk rotatably mounted thereon, means for rotating said disk, a fixed abutment centered over the rotation axis of said disk, a plate loosely mounted over said disk, a bending element mounted on said plate and slidable radially with respect to the rotation axis of the disk, a driving dog carried by said disk, a lug on the plate adapted to be engaged by said dog for rotating said plate, and means for releasing said dog from the lug and simultaneously therewith. sliding the bending element outwardly on the aforesaid plate.

4. A pipe bending machine comprising a frame, a disk rotatably mounted thereon, means for rotating said disk, a fixed abutment centered over the rotation axis of said disk, a plate loosely mounted over said disk, a bending element mounted on said plate and slidable radially with respect to the rotation axis of the disk, a lever mounted on said plate and having a toggle connection with said bending element, a cam connected to said lever at the pivotal point thereof, a driving dog slidably mounted on said disk, a lug on said plate adapted to be engaged by the dog for rotating said plate and bending element, said cam being adapted to engage the dog to release same from said lug on swinging the aforesaid lever to a position for withdrawing the bending element from the rotation axis of the aforesaid disk.

5. A pipe bending machine comprising a frame, a disk rotatably mounted thereon, means for rotating said disk, :1 fixed abutment-c-entered over the rotation axis of said disk, a plate loosely mounted over said disk, a bending element mounted on said plate and slidable radially with respect to the rotation axis of the disk, a driving dog carried by said disk a lug on the plate adapted to be engaged by said dog for rotating said plate, means for withdrawing the bending element from the abutment mem:

ber, and a cam for releasing said dog simultaneously with a Withdrawal of the bending element.

In testimony whereof I hereunto aflix my signature.

FREDERICK A. o. SKINNER. 

